Product Overview
Modern truck builders love the classic look of glass “watermelon” lights, but most options use fragile plastics or 19‑diode arrays that don’t dissipate heat. The original Glass is Class solved the lens problem with tempered glass but still relied on a 14 W two‑wire bulb. Gen 2 upgrades the entire system: a 15 W low‑power and 20 W high‑power AlphaFit G2 LED, oversized anodized aluminum body, and an internal fan that creates positive pressure to push moisture out. Compared with competitor lights that use polycarbonate lenses and basic heat‑sinks, Gen 2 delivers a brighter, cooler beam with no dark voids and legendary durability.
Key Features & Benefits
Dual‑Function AlphaFit G2 LED
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Marker + Signal in one lamp: the new three‑wire bulb offers a 15 W low‑power mode for marker lights and a 20 W high‑power mode for turn signals or full‑time use. Unlike competitors limited to 19‑diode arrays, AlphaFit G2 uses a straight PCB design that produces an even beam with no center dark spots.
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Run at full power 24/7: heat‑dissipation fins and an internal high‑speed fan pull heat away from the LED chip, so running on high power won’t shorten its lifespan.
Real Amber Glass Lens
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Tempered glass starburst optic: the lens is not plastic. Radial prisms in the amber glass create a sharp “star‑burst” pattern that diffuses light evenly across the road.
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Scratch and UV resistant: glass resists yellowing better than polycarbonate lenses and provides a premium retro look.
Enhanced Thermal Management & Positive‑Pressure Venting
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Oversized anodized aluminum housing: the bulb body and mounting base are milled from aluminum with a protective coating, pulling heat from the PCB down through the base.
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Passive fins + active fan: a radiator‑fin heat sink works with an internal high‑speed fan to draw heat away. This creates positive pressure, pushing condensation out through four PTFE one‑way vents.
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Silicone gasket & IP68 rating: a flat, thick silicone gasket seals the glass lens to the housing for an easy IP68 waterproof rating.
Customizable Lens & LED Combinations
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Multiple color options: besides Amber/Amber, Gen 2 offers Amber/White, Clear/Amber, Red/Red, Red/White, Clear/Red and Clear/White. Choose the lens tint and LED chip color that best matches your build.
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Standard H11 base: the AlphaFit G2 bulb retains an H11 socket so you can replace or upgrade the bulb easily.
Built for Heavy‑Duty & Show Applications
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Vibration resistant: the internal PCB and fan are shock‑mounted to survive harsh road conditions.
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Zero CANBUS interference: the bulb draws clean power and will not interfere with sensitive truck electronics.
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One‑year warranty: backed by BTS Lighting’s one‑year warranty on the lamp and bulb.
Performance / Compatibility / Use-Case
Most legacy watermelon lights rely on 19‑diode arrays or SMD bulbs that draw less power but create uneven light. Competitor products such as Legendary’s dual‑function glass watermelon light use 19 diodes and a chrome reflective base, while DOT‑compliant star‑burst lights use polycarbonate lenses. The Gen 2 Glass is Class uses an even‑beam AlphaFit G2 LED that eliminates dark zones and offers up to 20 W output. A key upgrade over the original AlphaFit lights is full 12‑V/24‑V compatibility—the lamp runs flawlessly on both voltage systems. It is ideal for semi‑truck cabs, air‑cleaner panels, pickup grilles and custom sleepers. Because of its high brightness, it is intended for show or off‑road use only and is not SAE/DOT compliant.
Installation / Fitment / Technical Details
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Plug‑and‑play wiring: the three‑wire harness uses common colors (ground, marker/low‑power, and signal/high‑power) for easy integration with 12‑V or 24‑V electrical systems. No additional resistors or modules are needed.
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Standard mounting footprint: fits existing watermelon light brackets and mounting holes. Brackets are sold separately.
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Compact profile: despite its dual‑function performance, the AlphaFit G2 bulb and housing fit into tight cab corners, torpedo lights or mirror mounts.
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Operating voltage: 12 V and 24 V systems; can handle full‑time high‑power use thanks to the active cooling system.
Build Quality / Warranty
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Tempered glass lens: thick amber glass resists chips and scratches and maintains clarity far longer than plastic alternatives.
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Anodized aluminum body: corrosion‑resistant and designed to draw heat away from the LED chip.
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Positive‑pressure venting: four PTFE one‑way vents expel condensation, preventing fogging.
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Silicone seal & IP68 protection: the flat silicone gasket keeps out water and dust.
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Warranty: BTS Lighting provides a one‑year limited warranty on the light and bulb. Competitor lights may offer a six‑month warranty or up to three years for plastic DOT‑compliant lights, but none match the performance of this dual‑function glass lens light.
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Brand credibility: BTS Lighting’s Alpha Series is trusted by show‑truck builders and heavy‑duty fleets for innovation and reliability.
Warranty: 1-Year Limited Warranty
Designed and validated by Alpha Series Lighting for real-world truck environments.
What’s Included
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1× Amber/Amber Glass is Class Gen 2 Watermelon Light assembly (tempered amber glass lens with anodized aluminum body and silicone gasket)
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1× Pre‑installed AlphaFit G2 LED bulb (three‑wire, dual‑function H11 base)
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Integrated passive heat‑sink fins and internal active cooling fan
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Pre‑terminated 3‑wire harness (ground, marker, and turn‑signal leads)
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Instructions for wiring and mounting
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Bracket not included (sold separately)
Frequently Asked Questions
What is different about the Gen 2 Glass is Class compared with the original?
The Gen 2 light uses the new AlphaFit G2 bulb—a three‑wire, dual‑function LED producing 15 W on marker mode and 20 W on turn‑signal mode—whereas the original used a 14 W two‑wire bulb. It also features an oversized anodized aluminum body, a silicone gasket for true IP68 sealing, internal fins and a high‑speed fan for cooling, and four venting valves that push condensation out.
Is this light DOT approved?
No. Because of its high brightness and custom beam pattern, the Glass is Class Gen 2 is intended for show and off‑road use. Always check local regulations before using it on public roads.
Can I run the lamp at full power all the time?
Yes. The AlphaFit G2 LED and the light’s active/passive cooling system are designed to dissipate heat efficiently. Running the high‑power lead continuously will not damage the bulb or housing.
How do I wire the three‑wire harness?
The harness includes a ground wire, a low‑power marker lead and a high‑power turn‑signal lead. Connect the ground to the vehicle chassis, the marker lead to your running‑light circuit and the high‑power lead to the turn‑signal or auxiliary circuit. You can choose to wire the high‑power lead for steady on if you want maximum brightness at all times.
Does the light include a mounting bracket?
No. As with the original Glass is Class, brackets are sold separately. The light uses the standard watermelon‑light bolt pattern and fits most aftermarket brackets.
Can I replace or upgrade the bulb later?
Yes. The AlphaFit G2 bulb uses a standard H11 base. Replacement bulbs and future upgrades can be swapped without replacing the entire light.
What lens and LED color combinations are available?
For the Gen 2 Glass is Class, you can choose from seven combinations: Amber/Amber, Amber/White, Clear/Amber, Red/Red, Red/White, Clear/Red and Clear/White. Each uses the same glass lens and housing but different LED chip colours for maximum customization.
How does the amber glass lens compare to plastic lenses?
Tempered glass offers superior scratch resistance and optical clarity. Unlike polycarbonate lenses used in some DOT‑compliant lights, glass does not yellow over time and can withstand higher temperatures without warping. This makes it ideal for show builds and high‑output applications.
Is the light compatible with 24‑V systems?
Yes. A major upgrade with the Gen 2 line is full dual‑voltage capability—the light is 100 % compatible with both 12‑V and 24‑V systems. No voltage reducer or special wiring is needed.
